Go the wrong way? (3)
'go the wrong way' is the definition.
(to err is to go astray)
This is the entire clue.
(Other definitions for err that I've seen before include "Go wrong" , "Make mistake in Canberra" , "Make a wrong move" , "Stray from the straight and narrow" , "have an affair?" .)
'go the wrong way?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sin that I've seen before include "trip" , "'Transgression, mortal or venial (3)'" , "Go astray" , "Serious error" , "Immoral act" .)